What is the test for showing prejudice in a claim of ineffective assistance of counsel?

The showing of prejudice requires "'a reasonable probability that a more favorable outcome would have resulted . . ., i.e., a probability sufficient to undermine confidence in the outcome.' [Citations.]" (People v. Fairbank(1997) 16 Cal.4th 1223, 1241.) "A defendant must prove prejudice that is a '"demonstrable reality," not simply speculation.' [Citations.]" (Ibid.) In evaluating a claim of ineffective assistance of counsel, "'a court need not determine whether counsel's performance was deficient before examining the prejudice suffered by the defendant as a result of the alleged deficiencies . . . . If it is

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